clang/test/CodeGenCXX/RelativeVTablesABI/diamond-virtual-inheritance.cpp

   1 // Diamond virtual inheritance.
   2 // This should cover virtual inheritance, construction vtables, and VTTs.
   3
   4 // RUN: %clang_cc1 %s -triple=aarch64-unknown-fuchsia -O1 -S -o - -emit-llvm -fhalf-no-semantic-interposition | FileCheck %s
   5
   6 // Class A contains a vtable ptr, then int, then padding
   7
   8 // VTable for B. Contains an extra field at the start for the virtual-base offset.
   9 // CHECK: @_ZTV1B.local = private unnamed_addr constant { [4 x i32], [4 x i32] } { [4 x i32] [i32 8, i32 0, i32 trunc (i64 sub (i64 ptrtoint (ptr @_ZTI1B.rtti_proxy to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTV1B.local, i32 0, i32 0, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1B4barBEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTV1B.local, i32 0, i32 0, i32 3) to i64)) to i32)], [4 x i32] [i32 0, i32 -8, i32 trunc (i64 sub (i64 ptrtoint (ptr @_ZTI1B.rtti_proxy to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTV1B.local, i32 0, i32 1, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1A3fooEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTV1B.local, i32 0, i32 1, i32 3) to i64)) to i32)] }, align 4
  10
  11 // VTT for B
  12 // CHECK: @_ZTT1B ={{.*}} unnamed_addr constant [2 x ptr] [ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTV1B.local, i32 0, inrange i32 0, i32 3), ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTV1B.local, i32 0, inrange i32 1, i32 3)], align 8
  13
  14 // VTable for C
  15 // CHECK: @_ZTV1C.local = private unnamed_addr constant { [4 x i32], [4 x i32] } { [4 x i32] [i32 8, i32 0, i32 trunc (i64 sub (i64 ptrtoint (ptr @_ZTI1C.rtti_proxy to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTV1C.local, i32 0, i32 0, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1C4barCEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTV1C.local, i32 0, i32 0, i32 3) to i64)) to i32)], [4 x i32] [i32 0, i32 -8, i32 trunc (i64 sub (i64 ptrtoint (ptr @_ZTI1C.rtti_proxy to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTV1C.local, i32 0, i32 1, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1A3fooEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTV1C.local, i32 0, i32 1, i32 3) to i64)) to i32)] }, align 4
  16
  17 // VTT for C
  18 // CHECK: @_ZTT1C ={{.*}} unnamed_addr constant [2 x ptr] [ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTV1C.local, i32 0, inrange i32 0, i32 3), ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTV1C.local, i32 0, inrange i32 1, i32 3)], align 8
  19
  20 // VTable for D
  21 // CHECK: @_ZTV1D.local = private unnamed_addr constant { [5 x i32], [4 x i32], [4 x i32] } { [5 x i32] [i32 16, i32 0, i32 trunc (i64 sub (i64 ptrtoint (ptr @_ZTI1D.rtti_proxy to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [5 x i32], [4 x i32], [4 x i32] }, ptr @_ZTV1D.local, i32 0, i32 0, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1B4barBEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [5 x i32], [4 x i32], [4 x i32] }, ptr @_ZTV1D.local, i32 0, i32 0, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1D3bazEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [5 x i32], [4 x i32], [4 x i32] }, ptr @_ZTV1D.local, i32 0, i32 0, i32 3) to i64)) to i32)], [4 x i32] [i32 8, i32 -8, i32 trunc (i64 sub (i64 ptrtoint (ptr @_ZTI1D.rtti_proxy to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [5 x i32], [4 x i32], [4 x i32] }, ptr @_ZTV1D.local, i32 0, i32 1, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1C4barCEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [5 x i32], [4 x i32], [4 x i32] }, ptr @_ZTV1D.local, i32 0, i32 1, i32 3) to i64)) to i32)], [4 x i32] [i32 0, i32 -16, i32 trunc (i64 sub (i64 ptrtoint (ptr @_ZTI1D.rtti_proxy to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [5 x i32], [4 x i32], [4 x i32] }, ptr @_ZTV1D.local, i32 0, i32 2, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1A3fooEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [5 x i32], [4 x i32], [4 x i32] }, ptr @_ZTV1D.local, i32 0, i32 2, i32 3) to i64)) to i32)] }, align 4
  22
  23 // VTT for D
  24 // CHECK: @_ZTT1D ={{.*}} unnamed_addr constant [7 x ptr] [ptr getelementptr inbounds ({ [5 x i32], [4 x i32], [4 x i32] }, ptr @_ZTV1D.local, i32 0, inrange i32 0, i32 3), ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTC1D0_1B.local, i32 0, inrange i32 0, i32 3), ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTC1D0_1B.local, i32 0, inrange i32 1, i32 3), ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTC1D8_1C.local, i32 0, inrange i32 0, i32 3), ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTC1D8_1C.local, i32 0, inrange i32 1, i32 3), ptr getelementptr inbounds ({ [5 x i32], [4 x i32], [4 x i32] }, ptr @_ZTV1D.local, i32 0, inrange i32 2, i32 3), ptr getelementptr inbounds ({ [5 x i32], [4 x i32], [4 x i32] }, ptr @_ZTV1D.local, i32 0, inrange i32 1, i32 3)], align 8
  25
  26 // Construction vtable for B-in-D
  27 // CHECK: @_ZTC1D0_1B.local = private unnamed_addr constant { [4 x i32], [4 x i32] } { [4 x i32] [i32 16, i32 0, i32 trunc (i64 sub (i64 ptrtoint (ptr @_ZTI1B.rtti_proxy to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTC1D0_1B.local, i32 0, i32 0, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1B4barBEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTC1D0_1B.local, i32 0, i32 0, i32 3) to i64)) to i32)], [4 x i32] [i32 0, i32 -16, i32 trunc (i64 sub (i64 ptrtoint (ptr @_ZTI1B.rtti_proxy to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTC1D0_1B.local, i32 0, i32 1, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1A3fooEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTC1D0_1B.local, i32 0, i32 1, i32 3) to i64)) to i32)] }, align 4
  28
  29 // Construction vtable for C-in-D
  30 // CHECK: @_ZTC1D8_1C.local = private unnamed_addr constant { [4 x i32], [4 x i32] } { [4 x i32] [i32 8, i32 0, i32 trunc (i64 sub (i64 ptrtoint (ptr @_ZTI1C.rtti_proxy to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTC1D8_1C.local, i32 0, i32 0, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1C4barCEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTC1D8_1C.local, i32 0, i32 0, i32 3) to i64)) to i32)], [4 x i32] [i32 0, i32 -8, i32 trunc (i64 sub (i64 ptrtoint (ptr @_ZTI1C.rtti_proxy to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTC1D8_1C.local, i32 0, i32 1, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1A3fooEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [4 x i32], [4 x i32] }, ptr @_ZTC1D8_1C.local, i32 0, i32 1, i32 3) to i64)) to i32)] }, align 4
  31
  32 // CHECK: @_ZTV1B ={{.*}} unnamed_addr alias { [4 x i32], [4 x i32] }, ptr @_ZTV1B.local
  33 // CHECK: @_ZTV1C ={{.*}} unnamed_addr alias { [4 x i32], [4 x i32] }, ptr @_ZTV1C.local
  34 // CHECK: @_ZTC1D0_1B ={{.*}} unnamed_addr alias { [4 x i32], [4 x i32] }, ptr @_ZTC1D0_1B.local
  35 // CHECK: @_ZTC1D8_1C ={{.*}} unnamed_addr alias { [4 x i32], [4 x i32] }, ptr @_ZTC1D8_1C.local
  36 // CHECK: @_ZTV1D ={{.*}} unnamed_addr alias { [5 x i32], [4 x i32], [4 x i32] }, ptr @_ZTV1D.local
  37
  38 // CHECK:      define{{.*}} void @_Z5D_fooP1D(ptr noundef %d) local_unnamed_addr
  39 // CHECK-NEXT: entry:
  40 // CHECK-NEXT:   [[vtable:%[a-z0-9]+]] = load ptr, ptr %d, align 8
  41
  42 // This normally would've been -24 (8 bytes for the virtual call/base offset, 8
  43 // bytes for the offset to top, and 8 bytes for the RTTI pointer), but since all
  44 // components in the vtable are halved to 4 bytes, the offset is halved to -12.
  45 // CHECK-NEXT:   [[vbase_offset_ptr:%[a-z0-9.]+]] = getelementptr i8, ptr [[vtable]], i64 -12
  46
  47 // CHECK-NEXT:   [[vbase_offset:%[a-z0-9.]+]] = load i32, ptr [[vbase_offset_ptr]], align 4
  48 // CHECK-NEXT:   [[vbase_offset2:%.+]] = sext i32 [[vbase_offset]] to i64
  49 // CHECK-NEXT:   [[add_ptr:%[a-z0-9.]+]] = getelementptr inbounds i8, ptr %d, i64 [[vbase_offset2]]
  50 // CHECK-NEXT:   [[vtable:%[a-z0-9]+]] = load ptr, ptr [[add_ptr]], align 8
  51 // CHECK-NEXT:   [[ptr:%[0-9]+]] = tail call ptr @llvm.load.relative.i32(ptr [[vtable]], i32 0)
  52 // CHECK-NEXT:   call void [[ptr]](ptr {{[^,]*}} [[add_ptr]])
  53 // CHECK-NEXT:   ret void
  54 // CHECK-NEXT: }
  55
  56 class A {
  57 public:
  58   virtual void foo();
  59   int a;
  60 };
  61
  62 class B : public virtual A {
  63 public:
  64   virtual void barB();
  65 };
  66
  67 class C : public virtual A {
  68   virtual void barC();
  69 };
  70
  71 class D : public B, C {
  72 public:
  73   virtual void baz();
  74 };
  75
  76 void B::barB() {}
  77 void C::barC() {}
  78 void D::baz() {}
  79
  80 void D_foo(D *d) {
  81   d->foo();
  82 }